title: Contemporary outcomes with the latest 1000 cases of multifetal pregnancy reduction (MPR).
abstract: OBJECTIVE
  This study was undertaken to report on the outcome of multifetal pregnancy reduction in the most up-to-date largest single center experience with this procedure, and compare the outcome to the first 1000 cases performed at the same institution.
  
  
  METHODS
  1000 consecutive cases of multifetal pregnancy reduction performed at the Mount Sinai Medical Center between the years 1999-2006 were identified. Pregnancy outcomes were retrieved from a large database as well as chart review. Differences in means and proportions were evaluated by analysis of variance, chi-square, Cochran-Armitage test for trend or 2-tailed Fisher exact test as appropriate.
  
  
  RESULTS
  Outcomes were available on 841 cases, for a follow-up rate of 84.1%; 95.2% of patients delivered after 24 weeks, for a complete loss rate of 4.7%. There was a significant trend toward decreasing loss rates with decreasing starting numbers. Mean gestational age at delivery was later, and birthweights greater, for reduction to singletons vs twins.
  
  
  CONCLUSIONS
  Loss rates after multifetal pregnancy reduction have remained stable at 4.7%. The lowest loss rate occurred in the patients reducing from twins to a singleton (2.1%). Reduction to a singleton was also associated with higher birthweights and lower rates of preterm deliveries.
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Mount Sinai School of Medicine, New York, NY, USA. joanne.stone@mssm.edu
authors.forename: Joanne
authors.initials: J
authors.lastname: Stone
authors.forename: Lauren
authors.initials: L
authors.lastname: Ferrara
authors.forename: Jacqueline
authors.initials: J
authors.lastname: Kamrath
authors.forename: Joelle
authors.initials: J
authors.lastname: Getrajdman
authors.forename: Richard
authors.initials: R
authors.lastname: Berkowitz
authors.forename: Erin
authors.initials: E
authors.lastname: Moshier
authors.forename: Keith
authors.initials: K
authors.lastname: Eddleman
mesh_terms: D000022:Abortion, Spontaneous; D000328:Adult; D001724:Birth Weight; D005260:Female; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011256:Pregnancy Outcome; D018607:Pregnancy Reduction, Multifetal / Q000706:statistics & numerical data*; D011272:Pregnancy, Multiple / Q000706:statistics & numerical data; D047928:Premature Birth / Q000453:epidemiology